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Actually, if you read scottyiu's post you will see that he thought feline's comments directed him to further material; this act was far more helpful than giving a canned reply that could be regurgitated without understanding. That would be what a real loser would do.

What is the hybridization of SeCl4 and IO2-?
:SeCl4, steric number = 5, thus the geometry of the central atom should be trigonal bipyramid, dsp3
[I(=O)(-O)]-, it should be sp3 for iodine.
You're correct on the phosphorus of PH4]+
However, for TeF5]-, the tellurium atom adopts an octahedral electron geometry, and thus it should be d2sp3 hybridised.http://www.iphonereleases.com

well......... it is a complicated topic,
but you probably don't need to go into it in huuuuge detail to still get some useful ideas out of it.

Basically, "hybridisation" is a concept used when describing how atoms bond together to form molecules - it is a way of describing how to "atomic orbitals" on the individual atoms combine to form the "molecular orbitals" that exist in the molecule.

It arises because we know that molecules have particular definate geometrical shapes (...how do we know this...?),
and we need to be able to explain how the orbitals/bonds form to build these shapes.

This will get u started.....
It's more something that you could read about in a couple of pages of a textbook though,
than have explained in a message board post.